.nav {
  margin: auto 0;
  width: 500px;
  height: 2500px;
  background-color: #72F1B8;
  border: black 2px solid;
}
.nav .nav2 {
  border: black 2px solid;
  border-left: none;
  border-right: none;
  margin-top: 10px;
}
